Sorry for not giving complete info:The computer is a Acer laptop, Running Windows XP, Service Pack 2I use the extended desktop on a "Viewsonic WPG-150" to send the pictures to the projector.The "Virtual cable" for sending sound to the projector is disabled as I want the sound to come from the soundcatd to the Mixer for the church sound system.Microsoft PowerPoint shower will play the sounds but only sends the video to the Pirimary monitor, so to get it on the projector I need to set the WPG to mirror mode not extend, and this disables some of the fetures that I need in our "SongBase" music presenter.I really would like to avoid having to purchase PowerPoint but I must be 100% compatable with everything that they can give me on Sunday morning.